header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  transition: top 0.3s ease;
  will-change: top;
  transform: translateZ(0);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo a {
  color: var(--text-primary);
  font-size: 1.8rem;
  font-weight: 700;
}

.logo span {
  color: var(--primary);
}

nav ul {
  display: flex;
  align-items: center;
  gap: 40px;
}

nav ul li a {
  position: relative;
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
}

nav ul li a::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary);
  transition: width 0.3s ease;
}

nav ul li a:hover,
nav ul li a.active {
  color: var(--primary);
  text-shadow: 0 0 5px var(--glow-color);
}

nav ul li a.active::after {
  width: 100%;
}

nav ul li a:focus-visible {
  outline: 2px solid transparent;
  box-shadow: var(--focus-ring);
  border-radius: 8px;
}

.nav-cta {
  padding: var(--btn-padding-y) var(--btn-padding-x);
  margin-left: 10px;
  font-size: 0.9rem;
  font-weight: var(--font-weight-semibold);
}

nav ul li a.nav-cta,
nav ul li a.nav-cta:visited,
nav ul li a.nav-cta:hover,
nav ul li a.nav-cta:active,
nav ul li a.nav-cta.active {
  color: var(--text-on-accent) !important;
  text-shadow: none;
}

.nav-cta:hover {
  color: var(--text-on-accent);
}

.nav-cta::after {
  display: none;
}

.hamburger,
.mobile-nav-header,
.mobile-nav-footer,
.mobile-nav-links,
.mobile-nav-card,
.mobile-nav-cta,
.mobile-nav-divider {
  display: none;
}

.desktop-theme-toggle-item {
  display: flex;
  align-items: center;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 40px;
}

@media (min-width: 1121px) {
  header {
    top: 28px;
    left: 50%;
    width: min(calc(100vw - 72px), 1440px);
    height: 92px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.13);
    border-bottom: 1px solid rgba(255, 255, 255, 0.13);
    border-radius: 999px;
    background:
      linear-gradient(90deg, rgba(18, 18, 20, 0.78), rgba(20, 20, 24, 0.86) 48%, rgba(15, 15, 18, 0.78)),
      rgba(10, 10, 12, 0.78);
    box-shadow:
      inset 0 1px 0 rgba(255, 255, 255, 0.08),
      inset 0 -1px 0 rgba(255, 255, 255, 0.04),
      0 0 0 1px rgba(168, 85, 247, 0.06),
      0 18px 68px rgba(0, 0, 0, 0.42),
      0 0 46px rgba(168, 85, 247, 0.14);
    backdrop-filter: blur(22px) saturate(1.18);
    -webkit-backdrop-filter: blur(22px) saturate(1.18);
    transform: translateX(-50%) translateZ(0);
  }

  header::before {
    content: '';
    position: absolute;
    inset: -1px;
    pointer-events: none;
    border-radius: inherit;
    background:
      radial-gradient(58% 120% at 50% 0%, rgba(168, 85, 247, 0.26), transparent 50%),
      radial-gradient(34% 150% at 50% 100%, rgba(255, 255, 255, 0.1), transparent 62%),
      linear-gradient(90deg, transparent 5%, rgba(168, 85, 247, 0.12) 50%, transparent 95%);
    opacity: 0.86;
  }

  header::after {
    content: '';
    position: absolute;
    top: -1px;
    left: 54px;
    right: 54px;
    height: 1px;
    pointer-events: none;
    background: linear-gradient(90deg, transparent, rgba(168, 85, 247, 0.78), rgba(255, 255, 255, 0.32), rgba(168, 85, 247, 0.78), transparent);
    opacity: 0.72;
  }

  header .container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: none;
    padding: 0 44px 0 62px;
  }

  .logo a {
    display: inline-flex;
    align-items: baseline;
    color: #ffffff;
    font-size: clamp(1.8rem, 2.2vw, 2.25rem);
    line-height: 1;
    letter-spacing: -0.04em;
    text-shadow: 0 12px 32px rgba(0, 0, 0, 0.36);
  }

  nav {
    display: flex;
    align-items: center;
    min-width: 0;
  }

  .desktop-nav {
    gap: clamp(18px, 1.65vw, 34px);
  }

  nav ul li a {
    color: rgba(255, 255, 255, 0.68);
    font-size: 0.98rem;
    line-height: 1.2;
    letter-spacing: 0;
    white-space: nowrap;
  }

  nav ul li a::after {
    bottom: -10px;
    height: 2px;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    box-shadow: 0 0 14px rgba(168, 85, 247, 0.58);
  }

  nav ul li a:hover,
  nav ul li a.active {
    color: var(--primary-light);
    text-shadow: 0 0 16px rgba(168, 85, 247, 0.38);
  }

  .desktop-nav .nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 54px;
    margin-left: clamp(6px, 1vw, 16px);
    padding: 0 28px;
    border: 0;
    border-radius: 999px;
    background:
      radial-gradient(92% 140% at 50% 0%, rgba(255, 255, 255, 0.26), transparent 44%),
      linear-gradient(135deg, #9f45ff 0%, #b14cff 48%, #951df0 100%);
    box-shadow:
      inset 0 1px 0 rgba(255, 255, 255, 0.24),
      0 14px 34px rgba(168, 85, 247, 0.34),
      0 0 28px rgba(168, 85, 247, 0.2);
    color: #ffffff !important;
    white-space: nowrap;
  }

  .desktop-nav .nav-cta::after {
    content: "\f061";
    position: static;
    display: inline-block;
    width: auto;
    height: auto;
    margin-left: 2px;
    background: none;
    box-shadow: none;
    color: currentColor;
    font-family: "Font Awesome 6 Free";
    font-size: 0.88rem;
    font-weight: 900;
    line-height: 1;
    transition: transform 0.24s ease;
  }

  /* Only the arrow moves on hover; the button itself stays in place */
  .desktop-nav .nav-cta:hover {
    transform: none;
    box-shadow:
      inset 0 1px 0 rgba(255, 255, 255, 0.24),
      0 14px 34px rgba(168, 85, 247, 0.34),
      0 0 28px rgba(168, 85, 247, 0.2);
  }

  .desktop-nav .nav-cta:hover::after {
    transform: translateX(4px);
  }

  .desktop-theme-toggle-item {
    margin-left: clamp(4px, 0.6vw, 12px);
  }

  #theme-toggle-nav {
    width: 54px;
    height: 54px;
    border-color: rgba(168, 85, 247, 0.24);
    background:
      radial-gradient(circle at 50% 0%, rgba(168, 85, 247, 0.18), transparent 62%),
      rgba(12, 12, 16, 0.62);
    color: #ffffff;
    box-shadow:
      inset 0 1px 0 rgba(255, 255, 255, 0.08),
      0 0 22px rgba(168, 85, 247, 0.12);
  }

  #theme-toggle-nav:hover {
    border-color: rgba(168, 85, 247, 0.58);
    background:
      radial-gradient(circle at 50% 0%, rgba(168, 85, 247, 0.3), transparent 66%),
      rgba(18, 18, 24, 0.78);
    color: #ffffff;
  }

  [data-theme="light"] header {
    border-color: rgba(40, 30, 60, 0.2);
    border-bottom-color: rgba(40, 30, 60, 0.2);
    background:
      linear-gradient(90deg, rgba(238, 235, 228, 0.72), rgba(238, 235, 228, 0.9) 48%, rgba(230, 226, 218, 0.76)),
      rgba(238, 235, 228, 0.78);
    box-shadow:
      inset 0 1px 0 rgba(238, 235, 228, 0.82),
      inset 0 -1px 0 rgba(40, 30, 60, 0.08),
      0 18px 62px rgba(60, 45, 30, 0.2),
      0 0 42px rgba(147, 51, 234, 0.12);
  }

  [data-theme="light"] header::before {
    background:
      radial-gradient(58% 120% at 50% 0%, rgba(147, 51, 234, 0.16), transparent 52%),
      radial-gradient(34% 150% at 50% 100%, rgba(238, 235, 228, 0.66), transparent 62%),
      linear-gradient(90deg, transparent 5%, rgba(147, 51, 234, 0.1) 50%, transparent 95%);
  }

  [data-theme="light"] .logo a {
    color: var(--text-primary);
    text-shadow: 0 12px 30px rgba(60, 45, 30, 0.14);
  }

  [data-theme="light"] nav ul li a {
    color: rgba(26, 26, 46, 0.68);
  }

  [data-theme="light"] nav ul li a:hover,
  [data-theme="light"] nav ul li a.active {
    color: var(--primary);
  }

  [data-theme="light"] #theme-toggle-nav {
    border-color: rgba(147, 51, 234, 0.2);
    background: rgba(238, 235, 228, 0.58);
    color: var(--text-primary);
  }
}

@media (min-width: 769px) and (max-width: 1120px) {
  header {
    overflow: visible;
  }

  header::before,
  header::after {
    display: none;
  }

  .desktop-nav,
  nav ul,
  .desktop-theme-toggle-item,
  .theme-toggle-edge {
    display: none;
  }

  .hamburger {
    display: flex;
    position: relative;
    z-index: 1001;
    width: 44px;
    height: 44px;
    cursor: pointer;
    border: 0;
    background: transparent;
    padding: 0;
    align-items: center;
    justify-content: center;
  }

  .hamburger .bar {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 25px;
    height: 3px;
    margin: 0;
    border-radius: 3px;
    background-color: var(--text-primary);
    transform: translate(-50%, -50%);
    transform-origin: center;
    transition: transform 0.25s ease, opacity 0.2s ease;
  }

  .hamburger .bar:nth-child(1) {
    transform: translate(-50%, calc(-50% - 8px));
  }

  .hamburger .bar:nth-child(3) {
    transform: translate(-50%, calc(-50% + 8px));
  }

  .hamburger.active .bar:nth-child(1) {
    transform: translate(-50%, -50%) rotate(45deg);
  }

  .hamburger.active .bar:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active .bar:nth-child(3) {
    transform: translate(-50%, -50%) rotate(-45deg);
  }

  nav {
    position: fixed;
    top: 0;
    right: 0;
    left: auto;
    --mobile-nav-gap: clamp(7px, 1.1dvh, 12px);
    --mobile-nav-card-height: clamp(56px, 8dvh, 76px);
    --mobile-nav-icon-size: clamp(40px, 6dvh, 54px);
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100dvh;
    max-height: 100dvh;
    box-sizing: border-box;
    overflow: hidden;
    padding: 0 clamp(20px, 5vw, 44px);
    background: linear-gradient(180deg, #0a0a12 0%, #0c0c14 100%);
    z-index: 1000;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), visibility 0s 0.4s;
  }

  nav.active {
    transform: translateX(0);
    visibility: visible;
    transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), visibility 0s;
  }

  .mobile-nav-header {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: clamp(66px, 9dvh, 90px);
    padding: max(clamp(14px, 2dvh, 24px), env(safe-area-inset-top)) 0 clamp(6px, 1dvh, 12px);
    box-sizing: border-box;
    flex-shrink: 0;
  }

  .mobile-logo {
    color: #ffffff;
    font-size: clamp(1.7rem, 3dvh, 2.2rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    text-decoration: none;
  }

  .mobile-logo span {
    color: var(--primary-light);
    font-weight: 900;
  }

  .mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: var(--mobile-nav-gap);
    flex: 0 1 auto;
    justify-content: flex-start;
    padding: clamp(4px, 0.7dvh, 8px) 0;
    overflow: hidden;
  }

  .mobile-nav-card {
    position: relative;
    display: grid;
    grid-template-columns: var(--mobile-nav-icon-size) 1fr auto;
    align-items: center;
    gap: clamp(12px, 1.8dvh, 18px);
    min-height: var(--mobile-nav-card-height);
    padding: clamp(8px, 1.1dvh, 12px) clamp(16px, 3dvh, 22px);
    box-sizing: border-box;
    overflow: hidden;
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: clamp(16px, 2.4dvh, 24px);
    background: rgba(255, 255, 255, 0.03);
    color: #ffffff;
    font-size: clamp(1rem, 1.8dvh, 1.15rem);
    font-weight: 600;
    text-decoration: none;
    transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
  }

  .mobile-nav-card:hover,
  .mobile-nav-card:focus-visible {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(168, 85, 247, 0.3);
    transform: translateX(4px);
    outline: none;
  }

  .mobile-nav-card.active {
    background: rgba(147, 51, 234, 0.15);
    border-color: rgba(168, 85, 247, 0.35);
    border-left: 0;
  }

  .mobile-nav-card.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 20%;
    width: 4px;
    height: 60%;
    border-radius: 0 4px 4px 0;
    background: linear-gradient(180deg, var(--primary-light), var(--primary-dark));
    box-shadow: 0 0 15px rgba(168, 85, 247, 0.6);
  }

  .nav-card-icon {
    display: grid;
    place-items: center;
    width: var(--mobile-nav-icon-size);
    height: var(--mobile-nav-icon-size);
    border-radius: clamp(11px, 1.8dvh, 15px);
    background: rgba(255, 255, 255, 0.04);
    color: rgba(255, 255, 255, 0.85);
    font-size: clamp(1.1rem, 2dvh, 1.35rem);
  }

  .mobile-nav-card.active .nav-card-icon {
    background: rgba(168, 85, 247, 0.25);
    color: var(--primary-light);
  }

  .nav-card-label {
    font-size: inherit;
    font-weight: 600;
  }

  .nav-card-indicator {
    display: grid;
    place-items: center;
    color: rgba(255, 255, 255, 0.35);
    font-size: clamp(0.85rem, 1.7dvh, 1rem);
  }

  .nav-card-indicator.active {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary-light);
    box-shadow: 0 0 12px rgba(168, 85, 247, 0.8);
  }

  .nav-card-indicator.active i {
    display: none;
  }

  .mobile-nav-cta {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(10px, 1.8dvh, 14px);
    min-height: clamp(56px, 8.5dvh, 72px);
    margin: var(--mobile-nav-gap) 0;
    padding: clamp(10px, 1.6dvh, 16px) clamp(18px, 3.6dvh, 28px);
    box-sizing: border-box;
    flex-shrink: 0;
    overflow: hidden;
    border-radius: clamp(16px, 2.6dvh, 24px);
    background: linear-gradient(135deg, #a855f7, #7e22ce);
    color: #ffffff;
    font-size: clamp(1rem, 2dvh, 1.15rem);
    font-weight: 600;
    text-decoration: none;
    box-shadow: 0 8px 32px rgba(147, 51, 234, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.15);
  }

  .mobile-nav-cta .nav-cta-arrow {
    margin-left: auto;
  }

  .mobile-nav-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: clamp(6px, 1dvh, 12px) 0;
    flex-shrink: 0;
  }

  .divider-line {
    flex: 1;
    height: 1px;
    background: rgba(255, 255, 255, 0.08);
  }

  .divider-sparkle {
    width: 8px;
    height: 8px;
    border-radius: 2px;
    background: #fbbf24;
    box-shadow: 0 0 12px rgba(251, 191, 36, 0.6);
    transform: rotate(45deg);
    flex-shrink: 0;
  }

  .mobile-nav-footer {
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(10px, 2.5vw, 16px);
    padding-top: clamp(2px, 0.8dvh, 8px);
    padding-bottom: max(clamp(8px, 1.4dvh, 14px), env(safe-area-inset-bottom));
    flex-shrink: 0;
  }

  .mobile-nav-footer-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(8px, 1.8dvh, 14px);
    min-height: clamp(48px, 7dvh, 62px);
    padding: clamp(8px, 1.5dvh, 14px) clamp(14px, 3dvh, 20px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: clamp(14px, 2.4dvh, 18px);
    background: rgba(255, 255, 255, 0.03);
    color: #ffffff;
    font-family: inherit;
    font-size: clamp(0.95rem, 1.8dvh, 1.1rem);
    font-weight: 600;
  }

  .mobile-nav-footer-btn i {
    color: #fbbf24;
  }

  [data-theme="light"] nav {
    background: var(--surface);
  }

  [data-theme="light"] .mobile-nav-card {
    border-color: rgba(0, 0, 0, 0.08);
    background: var(--surface);
    color: var(--text-primary);
  }

  [data-theme="light"] .mobile-nav-card:hover,
  [data-theme="light"] .mobile-nav-card:focus-visible {
    background: #f3f0ff;
  }

  [data-theme="light"] .mobile-nav-card.active {
    background: rgba(147, 51, 234, 0.06);
  }

  [data-theme="light"] .nav-card-icon {
    background: rgba(0, 0, 0, 0.04);
    color: rgba(0, 0, 0, 0.6);
  }

  [data-theme="light"] .mobile-nav-card.active .nav-card-icon {
    background: rgba(147, 51, 234, 0.12);
    color: var(--primary);
  }
}


@media (max-width: 768px) {
  .logo {
    transition: opacity 0.22s ease, visibility 0s linear 0.22s;
  }

  body.menu-open {
    overflow: hidden;
  }

  body.menu-open .logo {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.22s ease, visibility 0s linear 0s;
  }

  .hamburger {
    display: flex;
    position: relative;
    cursor: pointer;
    z-index: 1001; 
    width: 44px;
    height: 44px;
    border: none;
    background: transparent;
    padding: 0;
    align-items: center;
    justify-content: center;
  }
  .hamburger .bar {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    margin: 0;
    border-radius: 3px;
    transform: translate(-50%, -50%);
    transform-origin: center;
    transition: transform 0.25s ease, opacity 0.2s ease;
  }
  .hamburger .bar:nth-child(1) {
    transform: translate(-50%, calc(-50% - 8px));
  }
  .hamburger .bar:nth-child(3) {
    transform: translate(-50%, calc(-50% + 8px));
  }

  .hamburger.active .bar:nth-child(1) {
    transform: translate(-50%, -50%) rotate(45deg);
  }
  .hamburger.active .bar:nth-child(2) {
    opacity: 0;
  }
  .hamburger.active .bar:nth-child(3) {
    transform: translate(-50%, -50%) rotate(-45deg);
  }

  .desktop-nav {
    display: none;
  }

  nav {
    position: fixed;
    top: 0;
    right: 0;
    left: auto;
    --mobile-nav-gap: clamp(5px, 1dvh, 10px);
    --mobile-nav-card-height: clamp(52px, 10dvh, 72px);
    --mobile-nav-icon-size: clamp(38px, 7.5dvh, 52px);
    width: 100%;
    height: 100dvh;
    max-height: 100dvh;
    box-sizing: border-box;
    background: linear-gradient(180deg, #0a0a12 0%, #0c0c14 100%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 0 clamp(16px, 5vw, 24px);
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), visibility 0s 0.4s;
  }
  nav.active {
    transform: translateX(0);
    visibility: visible;
    transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), visibility 0s;
  }

  /* --- Mobile Nav Header --- */
  .mobile-nav-header {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: clamp(54px, 10dvh, 76px);
    padding: max(clamp(12px, 2dvh, 24px), env(safe-area-inset-top)) 0 clamp(4px, 1dvh, 10px) 0;
    box-sizing: border-box;
    flex-shrink: 0;
  }
  
  @supports (padding-top: constant(safe-area-inset-top)) {
    .mobile-nav-header {
      padding-top: constant(safe-area-inset-top);
    }
  }
  .mobile-logo {
    font-size: clamp(1.5rem, 4dvh, 2rem);
    font-weight: 800;
    color: #ffffff;
    text-decoration: none;
    letter-spacing: -0.02em;
  }
  .mobile-logo span {
    color: var(--primary-light);
    font-weight: 900;
  }

  /* --- Mobile Nav Cards --- */
  .mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: var(--mobile-nav-gap);
    flex: 0 1 auto;
    justify-content: flex-start;
    padding: clamp(2px, 0.6dvh, 6px) 0;
    overflow: hidden;
  }
  .mobile-nav-card {
    position: relative;
    display: grid;
    grid-template-columns: var(--mobile-nav-icon-size) 1fr auto;
    align-items: center;
    gap: clamp(10px, 2dvh, 16px);
    min-height: var(--mobile-nav-card-height);
    padding: clamp(7px, 1.2dvh, 10px) clamp(14px, 3dvh, 20px);
    box-sizing: border-box;
    border-radius: clamp(14px, 2.8dvh, 22px);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.06);
    color: #ffffff;
    text-decoration: none;
    font-size: clamp(0.95rem, 2.2dvh, 1.1rem);
    font-weight: 600;
    transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
    overflow: hidden;
    flex-shrink: 0;
  }
  .mobile-nav-card:hover,
  .mobile-nav-card:focus-visible {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(168, 85, 247, 0.3);
    transform: translateX(4px);
    outline: none;
  }
  .mobile-nav-card.active {
    background: rgba(147, 51, 234, 0.15);
    border-color: rgba(168, 85, 247, 0.35);
    border-left: 0;
  }
  .mobile-nav-card.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 20%;
    height: 60%;
    width: 4px;
    border-radius: 0 4px 4px 0;
    background: linear-gradient(180deg, var(--primary-light), var(--primary-dark));
    box-shadow: 0 0 15px rgba(168, 85, 247, 0.6);
  }
  .nav-card-icon {
    width: var(--mobile-nav-icon-size);
    height: var(--mobile-nav-icon-size);
    display: grid;
    place-items: center;
    border-radius: clamp(10px, 2dvh, 14px);
    background: rgba(255, 255, 255, 0.04);
    font-size: clamp(1.05rem, 2.6dvh, 1.35rem);
    color: rgba(255, 255, 255, 0.85);
    transition: background 0.25s ease, color 0.25s ease;
  }
  .mobile-nav-card.active .nav-card-icon {
    background: rgba(168, 85, 247, 0.25);
    color: var(--primary-light);
  }
  .nav-card-label {
    font-weight: 600;
    font-size: clamp(0.95rem, 2.2dvh, 1.1rem);
  }
  .nav-card-indicator {
    display: grid;
    place-items: center;
    color: rgba(255, 255, 255, 0.35);
    font-size: clamp(0.85rem, 2dvh, 1rem);
  }
  .nav-card-indicator.active {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary-light);
    box-shadow: 0 0 12px rgba(168, 85, 247, 0.8);
    opacity: 1;
  }
  .nav-card-indicator.active i {
    display: none;
  }

  /* --- Mobile CTA --- */
  .mobile-nav-cta {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(10px, 2dvh, 14px);
    min-height: clamp(54px, 10dvh, 70px);
    padding: clamp(10px, 1.8dvh, 16px) clamp(18px, 4dvh, 28px);
    box-sizing: border-box;
    border-radius: clamp(16px, 3dvh, 24px);
    background: linear-gradient(135deg, #a855f7, #7e22ce);
    color: #fff;
    font-weight: 600;
    font-size: clamp(1rem, 2.4dvh, 1.15rem);
    text-decoration: none;
    flex-shrink: 0;
    margin: var(--mobile-nav-gap) 0;
    box-shadow: 0 8px 32px rgba(147, 51, 234, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.15);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    overflow: hidden;
  }
  .mobile-nav-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  }
  .mobile-nav-cta i:first-child {
    font-size: clamp(1.05rem, 2.6dvh, 1.3rem);
  }
  .mobile-nav-cta .nav-cta-arrow {
    margin-left: auto;
    transition: transform 0.2s ease;
    font-size: clamp(1rem, 2.4dvh, 1.2rem);
  }
  .mobile-nav-cta:hover .nav-cta-arrow {
    transform: translateX(3px);
  }

  /* --- Mobile Divider --- */
  .mobile-nav-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: clamp(6px, 1.2dvh, 12px) 0;
    flex-shrink: 0;
  }
  .divider-line {
    flex: 1;
    height: 1px;
    background: rgba(255, 255, 255, 0.08);
  }
  .divider-sparkle {
    width: 8px;
    height: 8px;
    background: #fbbf24;
    border-radius: 2px;
    transform: rotate(45deg);
    box-shadow: 0 0 12px rgba(251, 191, 36, 0.6);
    flex-shrink: 0;
  }

  /* --- Mobile Nav Footer --- */
  .mobile-nav-footer {
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(10px, 2.5vw, 16px);
    padding-bottom: max(clamp(8px, 1.4dvh, 14px), env(safe-area-inset-bottom));
    flex-shrink: 0;
    padding-top: clamp(2px, 0.8dvh, 8px);
  }
  .mobile-nav-footer-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(8px, 1.8dvh, 14px);
    min-height: clamp(48px, 8.5dvh, 62px);
    padding: clamp(8px, 1.5dvh, 14px) clamp(14px, 3dvh, 20px);
    box-sizing: border-box;
    border-radius: clamp(14px, 2.8dvh, 18px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(255, 255, 255, 0.03);
    color: #ffffff;
    font-size: clamp(0.95rem, 2.2dvh, 1.1rem);
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease;
  }
  .mobile-nav-footer-btn:hover,
  .mobile-nav-footer-btn:focus-visible {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(168, 85, 247, 0.3);
    outline: none;
  }
  .mobile-nav-footer-btn i {
    font-size: clamp(1.05rem, 2.5dvh, 1.3rem);
    color: #fbbf24;
  }

  /* --- Desktop nav hidden on mobile (ul) --- */
  nav ul {
    display: none;
  }

  .desktop-theme-toggle-item {
    display: none;
  }

  .theme-toggle-edge {
    display: none;
  }

  [data-theme="light"] nav {
    background: var(--surface);
  }
  [data-theme="light"] .mobile-nav-card {
    background: var(--surface);
    border-color: rgba(0, 0, 0, 0.08);
    color: var(--text-primary);
  }
  [data-theme="light"] .mobile-nav-card:hover,
  [data-theme="light"] .mobile-nav-card:focus-visible {
    background: #f3f0ff;
  }
  [data-theme="light"] .mobile-nav-card.active {
    background: rgba(147, 51, 234, 0.06);
  }
  [data-theme="light"] .nav-card-icon {
    background: rgba(0, 0, 0, 0.04);
    color: rgba(0, 0, 0, 0.6);
  }
  [data-theme="light"] .mobile-nav-card.active .nav-card-icon {
    background: rgba(147, 51, 234, 0.12);
    color: var(--primary);
  }
  [data-theme="light"] .nav-card-indicator {
    color: rgba(0, 0, 0, 0.25);
  }
  [data-theme="light"] .mobile-logo {
    color: var(--text-primary);
  }
  [data-theme="light"] .mobile-nav-footer-btn {
    background: var(--surface);
    border-color: rgba(0, 0, 0, 0.08);
    color: var(--text-primary);
  }
  [data-theme="light"] .mobile-nav-footer-btn:hover,
  [data-theme="light"] .mobile-nav-footer-btn:focus-visible {
    background: #f3f0ff;
    border-color: var(--primary);
  }
  [data-theme="light"] .mobile-nav-divider .divider-sparkle {
    box-shadow: 0 0 10px rgba(217, 170, 30, 0.4);
  }
  [data-theme="light"] .divider-line {
    background: rgba(0, 0, 0, 0.08);
  }
  [data-theme="light"] .mobile-nav-footer-btn {
    color: var(--text-primary);
  }
  [data-theme="light"] .mobile-nav-footer-btn i {
    color: #f59e0b;
  }


}

@media (max-width: 1120px) {
  body.menu-open header {
    background: transparent;
    border-color: transparent;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  #menu-overlay {
    position: fixed;
    inset: 0;
    z-index: 998;
    background:
      radial-gradient(circle at 18% 12%, rgba(168, 85, 247, 0.16), transparent 32%),
      rgba(3, 4, 12, 0.68);
    opacity: 0;
    pointer-events: none;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    transition: opacity 0.32s ease;
  }

  body.menu-open #menu-overlay {
    opacity: 1;
    pointer-events: auto;
  }

  nav {
    --mobile-nav-gap: clamp(8px, 1.2dvh, 12px);
    --mobile-nav-card-height: clamp(54px, 6.8dvh, 66px);
    --mobile-nav-icon-size: clamp(30px, 4.6dvh, 38px);
    width: clamp(244px, 68vw, 430px);
    padding:
      max(28px, env(safe-area-inset-top))
      clamp(18px, 4.4vw, 32px)
      max(22px, env(safe-area-inset-bottom));
    overflow-x: hidden;
    overflow-y: auto;
    border-left: 1px solid rgba(255, 255, 255, 0.1);
    background:
      radial-gradient(86% 42% at 100% 0%, rgba(125, 59, 226, 0.34), transparent 68%),
      radial-gradient(82% 48% at 0% 32%, rgba(109, 40, 217, 0.22), transparent 72%),
      linear-gradient(180deg, rgba(5, 6, 17, 0.98) 0%, rgba(8, 8, 19, 0.99) 100%);
    box-shadow:
      -28px 0 72px rgba(0, 0, 0, 0.46),
      -14px 0 48px rgba(88, 28, 135, 0.18),
      inset 1px 0 0 rgba(255, 255, 255, 0.05);
    scrollbar-width: none;
  }

  nav::-webkit-scrollbar {
    display: none;
  }

  nav.active {
    transform: translateX(0);
  }

  body.menu-open .hamburger {
    position: fixed;
    top: max(22px, env(safe-area-inset-top));
    right: clamp(18px, 5.6vw, 28px);
    z-index: 1002;
    width: 48px;
    height: 48px;
  }

  body.menu-open .hamburger .bar {
    width: 30px;
    height: 3px;
    background: #ffffff;
    box-shadow: 0 0 18px rgba(255, 255, 255, 0.12);
  }

  .mobile-nav-header {
    justify-content: flex-start;
    min-height: clamp(66px, 9.2dvh, 90px);
    padding: 0 54px clamp(14px, 2dvh, 22px) 0;
  }

  .mobile-logo {
    color: #ffffff;
    font-size: clamp(1.7rem, 3.5dvh, 2.25rem);
    font-weight: 800;
    letter-spacing: 0;
    line-height: 1;
    text-shadow: 0 10px 30px rgba(0, 0, 0, 0.34);
  }

  .mobile-logo span {
    color: #a855f7;
  }

  .mobile-nav-links {
    gap: 0;
    flex: 0 0 auto;
    padding: clamp(6px, 1dvh, 10px) 0 0;
    overflow: visible;
  }

  .mobile-nav-card {
    grid-template-columns: var(--mobile-nav-icon-size) minmax(0, 1fr);
    gap: clamp(12px, 2dvh, 16px);
    min-height: var(--mobile-nav-card-height);
    padding: clamp(10px, 1.5dvh, 14px) clamp(12px, 2.6vw, 18px);
    border: 0;
    border-radius: 0;
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    font-size: clamp(0.95rem, 1.9dvh, 1.12rem);
    font-weight: 500;
    box-shadow: none;
    transform: none;
  }

  .mobile-nav-card:hover,
  .mobile-nav-card:focus-visible {
    background: rgba(255, 255, 255, 0.035);
    border-color: transparent;
    transform: translateX(3px);
  }

  .mobile-nav-card.active {
    min-height: clamp(62px, 8dvh, 76px);
    margin-bottom: clamp(10px, 1.5dvh, 16px);
    border: 1px solid rgba(168, 85, 247, 0.28);
    border-radius: clamp(18px, 3dvh, 26px);
    background:
      linear-gradient(100deg, rgba(110, 69, 220, 0.56), rgba(69, 39, 137, 0.72)),
      rgba(56, 37, 119, 0.82);
    color: #ffffff;
    font-weight: 700;
    box-shadow:
      0 18px 48px rgba(79, 40, 153, 0.25),
      inset 0 1px 0 rgba(255, 255, 255, 0.1);
  }

  .mobile-nav-card.active::before {
    display: none;
  }

  .nav-card-icon {
    width: var(--mobile-nav-icon-size);
    height: var(--mobile-nav-icon-size);
    border-radius: 0;
    background: transparent;
    color: rgba(255, 255, 255, 0.72);
    font-size: clamp(1.08rem, 2.35dvh, 1.35rem);
  }

  .mobile-nav-card.active .nav-card-icon {
    background: transparent;
    color: #a855f7;
  }

  .nav-card-label {
    overflow: hidden;
    font-size: inherit;
    font-weight: inherit;
    line-height: 1.2;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .nav-card-indicator {
    display: none;
  }

  .mobile-nav-cta {
    justify-content: flex-start;
    gap: clamp(10px, 1.8dvh, 14px);
    min-height: clamp(56px, 7.5dvh, 68px);
    margin: clamp(22px, 3.8dvh, 38px) 0 0;
    padding: clamp(11px, 1.6dvh, 15px) clamp(16px, 3.6vw, 22px);
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: clamp(18px, 3dvh, 24px);
    background: linear-gradient(105deg, #b244ff 0%, #8421e7 58%, #7418d0 100%);
    color: #ffffff;
    font-size: clamp(0.95rem, 2dvh, 1.12rem);
    font-weight: 700;
    box-shadow:
      0 18px 52px rgba(127, 34, 206, 0.36),
      inset 0 1px 0 rgba(255, 255, 255, 0.2);
  }

  .mobile-nav-cta span {
    min-width: 0;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .mobile-nav-cta i:first-child {
    font-size: clamp(1.08rem, 2.35dvh, 1.35rem);
  }

  .mobile-nav-cta .nav-cta-arrow {
    margin-left: 0;
    font-size: clamp(1.15rem, 2.45dvh, 1.42rem);
  }

  .mobile-nav-divider {
    display: none;
  }

  .mobile-nav-footer {
    display: block;
    margin-top: clamp(20px, 3.5dvh, 34px);
    padding: 0;
  }

  .mobile-nav-footer-btn {
    justify-content: flex-start;
    width: 100%;
    min-height: clamp(54px, 7.2dvh, 66px);
    gap: clamp(10px, 1.8dvh, 14px);
    padding: clamp(10px, 1.5dvh, 14px) clamp(14px, 3.4vw, 20px);
    border: 1px solid rgba(255, 255, 255, 0.09);
    border-radius: clamp(16px, 2.8dvh, 22px);
    background: rgba(255, 255, 255, 0.035);
    color: #ffffff;
    box-shadow:
      inset 0 1px 0 rgba(255, 255, 255, 0.05),
      0 14px 38px rgba(0, 0, 0, 0.24);
  }

  .mobile-nav-footer-btn:hover,
  .mobile-nav-footer-btn:focus-visible {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(168, 85, 247, 0.3);
  }

  .mobile-nav-footer-btn i {
    width: var(--mobile-nav-icon-size);
    color: #ffffff;
    font-size: clamp(1.08rem, 2.35dvh, 1.35rem);
    text-align: center;
  }

  .mobile-nav-footer-btn span:not(.theme-switch) {
    flex: 1;
    font-size: clamp(0.95rem, 2dvh, 1.12rem);
    font-weight: 700;
    text-align: left;
  }

  .theme-switch {
    position: relative;
    width: 46px;
    height: 26px;
    flex: 0 0 46px;
    border-radius: 999px;
    background: linear-gradient(90deg, #9733ee, #7b20dc);
    box-shadow:
      inset 0 1px 2px rgba(255, 255, 255, 0.22),
      0 0 22px rgba(168, 85, 247, 0.24);
  }

  .theme-switch::before {
    content: "";
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #ffffff;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.28);
    transform: translateX(20px);
    transition: transform 0.24s ease;
  }

  [data-theme="light"] #menu-overlay {
    background:
      radial-gradient(circle at 18% 12%, rgba(147, 51, 234, 0.12), transparent 32%),
      rgba(15, 18, 31, 0.42);
  }

  [data-theme="light"] nav {
    border-left-color: rgba(40, 30, 60, 0.22);
    background:
      radial-gradient(86% 42% at 100% 0%, rgba(168, 85, 247, 0.16), transparent 68%),
      linear-gradient(180deg, rgba(234, 230, 223, 0.98) 0%, rgba(224, 220, 212, 0.98) 100%);
    box-shadow:
      -28px 0 72px rgba(42, 50, 72, 0.18),
      -14px 0 48px rgba(147, 51, 234, 0.12),
      inset 1px 0 0 rgba(238, 235, 228, 0.7);
  }

  [data-theme="light"] .mobile-logo,
  [data-theme="light"] .mobile-nav-card.active,
  [data-theme="light"] .mobile-nav-footer-btn {
    color: var(--text-primary);
  }

  [data-theme="light"] .mobile-nav-card {
    background: transparent;
    border-color: rgba(40, 30, 60, 0.12);
    color: rgba(20, 24, 39, 0.66);
  }

  [data-theme="light"] .mobile-nav-card:hover,
  [data-theme="light"] .mobile-nav-card:focus-visible {
    background: rgba(147, 51, 234, 0.045);
  }

  [data-theme="light"] .mobile-nav-card.active {
    border-color: rgba(147, 51, 234, 0.18);
    background: linear-gradient(100deg, rgba(246, 240, 255, 0.92), rgba(229, 216, 255, 0.86));
  }

  [data-theme="light"] .nav-card-icon {
    background: transparent;
    color: rgba(20, 24, 39, 0.58);
  }

  [data-theme="light"] .mobile-nav-card.active .nav-card-icon {
    background: transparent;
    color: var(--primary);
  }

  [data-theme="light"] .mobile-nav-footer-btn {
    background: rgba(238, 235, 228, 0.72);
    border-color: rgba(40, 30, 60, 0.1);
  }

  [data-theme="light"] .mobile-nav-footer-btn i {
    color: var(--text-primary);
  }

  [data-theme="light"] .theme-switch {
    background: rgba(123, 133, 153, 0.32);
    box-shadow: inset 0 1px 2px rgba(238, 235, 228, 0.46);
  }

  [data-theme="light"] .theme-switch::before {
    transform: translateX(0);
  }
}

@media (max-width: 420px) {
  nav {
    width: clamp(244px, 70vw, 294px);
  }
}